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Message: <blockquote data-quote="Tazza" data-source="post: 24602" data-attributes="member: 82">Working on the old style machines:You have the series, be it 4, 5, 6, 7, 8 etc like 743 is a 7 series machine, 843 is an 8 series machine which is larger and more powerful than the 743.Then you go the vintage which is the second number. you had a 731 which is older than the 741 then 751, 763. Does that make sense?Then to get really complicated.... You have the first 2 numbers so thats vintage and series. Then the third number used to be 1 was air cooled, 2 was water cooled petrol, 3 was water cooled diesel. Like the 741 used an air cooled deutz the 742 used a water cooled mitsubishi or ford petrol, 743 used a liquid cooled kubota diesel. This was correct up to the 751 which used a luquid cooled pug diesel!Just work on the first 2 numbers, series and vintage is your best option. But then you get the G series that a 753 can be newer than a 763 and then the S series!!!! i have no way to work those one out i'm afraid.I hope at least a little of that made sense, not sure it made total sense to me either!</blockquote>